@virtus Which version are you using?
For the hosted version (Ray’s website): In the side panel (the top left button on the homepage) there are two options. The first one is Change OS IP/password and the other is Remove OS IP/password. This version saves the password in your browser’s local storage. If you ever need to remove the current configuration you can delete the local storage for that specific website (each browser is different making it difficult to give instructions on how to accomplish this).
For the installed version: Inside config.php is a variable called $os_pw. After the equal sign and inside the quotes is the saved password, just replace it.